Snom C52-SP DECT Compatible Battery 7.2V 2000mAh Ni-MH

Snom C52-SP DECT Expansion Speakerphone — 7.2V Ni-MH Replacement Battery (GP230AAHC6YMXZ)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Snom C52-SP DECT Expansion Speakerphone. It replaces OEM part GP230AAHC6YMXZ directly. The C52-SP is a wireless conference speakerphone, and this battery is what keeps it untethered during meetings.

• C52-SP platform fit: The C52-SP runs a 7.2V Ni-MH pack to handle combined DECT radio and audio amplifier draw simultaneously. This replacement matches that voltage rail and cell arrangement, so the BMS reads state-of-charge correctly from the first session.
• Bench tested on actual hardware: We cycled this pack under a combined wireless-plus-audio load profile that mirrors a live conference call. The BMS held stable across the draw curve without triggering a low-voltage cutoff early.
• First-session calibration tip: After installing, run one full charge before the first meeting. The C52-SP maps battery state during normal operation, and without that initial full charge, the onboard indicator may flag a false low-battery warning mid-session.

Voltage sag under combined DECT and audio draw in the C52-SP

The C52-SP pulls current from two systems at once — the DECT radio module and the speaker amplifier. A degraded or deeply discharged pack cannot sustain the combined draw, and voltage drops below the BMS threshold during active calls. This triggers a protective cutoff that looks like a sudden power failure mid-meeting. A fresh pack at full charge holds the voltage rail above the 6.0V cutoff point where the BMS would otherwise intervene.

Battery indicator showing wrong charge level after installation

The C52-SP estimates charge level by tracking voltage thresholds, not a fuel gauge IC. A new pack comes off storage at a partial state of charge, so the unit has no reference point yet. This causes the indicator to show an inaccurate level — sometimes too high, sometimes too low — for the first session. Run one complete charge cycle to the dock's charge-complete signal, then discharge through normal use, and the indicator will read correctly from the next session onward.